Comments on: I have a Dell Latitude C640 laptop. It shuts off all the time and can usually only get windows loaded and it’ll shut right off http://www.asklaptopfreak.com/laptop-notebook-help/2006/07/09/dell-latitude-c640-shuts-off/ Your laptop computer doesn't work? Need help or support for your notebook? Ask the Laptop Freak! Mon, 30 Jan 2012 16:03:21 +0000 hourly 1 http://wordpress.org/?v=3.3.1 By: Ian http://www.asklaptopfreak.com/laptop-notebook-help/2006/07/09/dell-latitude-c640-shuts-off/comment-page-4/#comment-297052 Ian Mon, 24 Jan 2011 21:33:00 +0000 http://www.asklaptopfreak.com/laptop-notebook-help/2006/07/09/dell-latitude-c640-shuts-off/#comment-297052 FIXED IT!!!!… YES…YES….YES!!!!!! …..and within 5minutes! It started like this: My Latitude C640 was working fine. I seldom used it except on vacations and it was kept in its case. However, I took it out and updated everything since it hadn't been on for about 6 months when I was in Florida. I turned it on two days later and it wouldn't boot. Sometimes for maybe 2-3 seconds up to a minute, maximum. I tried about everything and was ready to kiss it goodbye until I read a posting. The solution just seemed to simple but lo behold, it worked. To boot it, I pressed and held down the power button for 20 seconds and it booted for about a minute. I tried it again and continually held it until it completely booted up. It is working great now. FIXED IT!!!!… YES…YES….YES!!!!!! …..and within 5minutes!
It started like this: My Latitude C640 was working fine. I seldom used it except on vacations and it was kept in its case. However, I took it out and updated everything since it hadn’t been on for about 6 months when I was in Florida. I turned it on two days later and it wouldn’t boot. Sometimes for maybe 2-3 seconds up to a minute, maximum.
I tried about everything and was ready to kiss it goodbye until I read a posting. The solution just seemed to simple but lo behold, it worked. To boot it, I pressed and held down the power button for 20 seconds and it booted for about a minute. I tried it again and continually held it until it completely booted up.
It is working great now.

]]> By: tom http://www.asklaptopfreak.com/laptop-notebook-help/2006/07/09/dell-latitude-c640-shuts-off/comment-page-4/#comment-194355 tom Wed, 14 Jul 2010 13:55:01 +0000 http://www.asklaptopfreak.com/laptop-notebook-help/2006/07/09/dell-latitude-c640-shuts-off/#comment-194355 so when the fan isnt moving, that means it's an overheating problem? because when i blow in it , it goes, then stops.... so when the fan isnt moving, that means it’s an overheating problem? because when i blow in it , it goes, then stops….

]]> By: Mika http://www.asklaptopfreak.com/laptop-notebook-help/2006/07/09/dell-latitude-c640-shuts-off/comment-page-4/#comment-185886 Mika Tue, 15 Jun 2010 05:47:23 +0000 http://www.asklaptopfreak.com/laptop-notebook-help/2006/07/09/dell-latitude-c640-shuts-off/#comment-185886 Hi Other things can cause a laptop to turn on and off. Like the ram is going bad in it. I had one of those a few weeks ago. Tested the computer with pc check v6 disk and the ram failed. My question is that I am not sure on...Is if you have a latitude c640 and it isnt upgradeable to run windows 7 but you are running it witn only 768 mb ram and 100 gb hd. with its original motherboard and cpu...Would it slowly fry the motherboard because its running something that needs more ram then what the system can provide? Hi
Other things can cause a laptop to turn on and off. Like the ram is going bad in it. I had one of those a few weeks ago. Tested the computer with pc check v6 disk and the ram failed.

My question is that I am not sure on…Is if you have a latitude c640 and it isnt upgradeable to run windows 7 but you are running it witn only 768 mb ram and 100 gb hd. with its original motherboard and cpu…Would it slowly fry the motherboard because its running something that needs more ram then what the system can provide?

]]> By: frankie http://www.asklaptopfreak.com/laptop-notebook-help/2006/07/09/dell-latitude-c640-shuts-off/comment-page-4/#comment-181181 frankie Thu, 27 May 2010 16:52:36 +0000 http://www.asklaptopfreak.com/laptop-notebook-help/2006/07/09/dell-latitude-c640-shuts-off/#comment-181181 hi, i scored a dell c810 quitte cheap .. he turns on and off after a few seconds.. i opened the lap and i saw there a small powerboard at the front onder the touchpad might the small board be the problem or is it a fet to the cpu-power? thanx!! hi,

i scored a dell c810 quitte cheap ..
he turns on and off after a few seconds..
i opened the lap and i saw there a small powerboard at the front onder the touchpad
might the small board be the problem or is it a fet to the cpu-power?

thanx!!

]]> By: Flusensieb http://www.asklaptopfreak.com/laptop-notebook-help/2006/07/09/dell-latitude-c640-shuts-off/comment-page-4/#comment-180640 Flusensieb Sun, 23 May 2010 09:09:13 +0000 http://www.asklaptopfreak.com/laptop-notebook-help/2006/07/09/dell-latitude-c640-shuts-off/#comment-180640 Hi, @112 Emiliano: Thank you for this information. I fixed a C640 in the same way Emiliano did. I replaced the damaged IC on position U45 on the board with a very small selfmade circuit board. I put a BC 807-16 SMD (similar to 2N2907) transistor with a 15K Ohm (SMD) resistor in the base on this selfmade circuit board. I used some wires to connect U45 and this small board. No it works great. Thanks for your help! Hi,

@112 Emiliano: Thank you for this information.

I fixed a C640 in the same way Emiliano did.
I replaced the damaged IC on position U45 on the board with a very small selfmade circuit board.
I put a BC 807-16 SMD (similar to 2N2907) transistor with a 15K Ohm (SMD) resistor in the base on this selfmade circuit board.
I used some wires to connect U45 and this small board.
No it works great.
Thanks for your help!

]]> By: frankie68 http://www.asklaptopfreak.com/laptop-notebook-help/2006/07/09/dell-latitude-c640-shuts-off/comment-page-4/#comment-177631 frankie68 Sun, 02 May 2010 18:58:59 +0000 http://www.asklaptopfreak.com/laptop-notebook-help/2006/07/09/dell-latitude-c640-shuts-off/#comment-177631 hi ali, i had the same with a c640 board.. as soon as i plugged the adapter the adapter goes off. so i soldered some things from another c640 mother board as a experiment and put it on the c640 .. at least he turned on ! but the short came back after two minutes.. i replaced the 8-leg ic right behind the jack (on top) and one of the 8 8-leg ic's on the very right side (close to the video connection) so the short should be somewhere there (i think) hi ali,

i had the same with a c640 board..
as soon as i plugged the adapter the adapter goes off.
so i soldered some things from another c640 mother board as a experiment and put it on the c640 ..
at least he turned on ! but the short came back after two minutes..
i replaced the 8-leg ic right behind the jack (on top)
and one of the 8 8-leg ic’s on the very right side (close to
the video connection)
so the short should be somewhere there (i think)

]]> By: ali alazzawi http://www.asklaptopfreak.com/laptop-notebook-help/2006/07/09/dell-latitude-c640-shuts-off/comment-page-4/#comment-177060 ali alazzawi Wed, 28 Apr 2010 09:45:40 +0000 http://www.asklaptopfreak.com/laptop-notebook-help/2006/07/09/dell-latitude-c640-shuts-off/#comment-177060 hi in the first my languge is not very good so i will try to explane my problem as i can i have laptop dell latitude c600 and when i plugg the AC adaptar it will turn off and i will plugg the ac adaptar in another laptop it will work fine then i know the problem in my moatherboard so iwant to learn how i fine the short in my board hi
in the first my languge is not very good
so i will try to explane my problem as i can
i have laptop dell latitude c600 and when i plugg the AC adaptar it will turn off and i will plugg the ac adaptar in another laptop it will work fine
then i know the problem in my moatherboard so iwant to learn how i fine the short in my board

]]> By: frankie68 http://www.asklaptopfreak.com/laptop-notebook-help/2006/07/09/dell-latitude-c640-shuts-off/comment-page-4/#comment-171111 frankie68 Sat, 20 Mar 2010 03:52:52 +0000 http://www.asklaptopfreak.com/laptop-notebook-help/2006/07/09/dell-latitude-c640-shuts-off/#comment-171111 i fixed another c640 with a maxim chip from a dell d600!! it's located at place U20 Under the black wide tape where the pcima socket is.. it's the same chip as the c640 i fixed another c640 with a maxim chip from a dell d600!!
it’s located at place U20

Under the black wide tape where the pcima socket is..
it’s the same chip as the c640

]]> By: frankie68 http://www.asklaptopfreak.com/laptop-notebook-help/2006/07/09/dell-latitude-c640-shuts-off/comment-page-4/#comment-169100 frankie68 Mon, 08 Mar 2010 00:26:09 +0000 http://www.asklaptopfreak.com/laptop-notebook-help/2006/07/09/dell-latitude-c640-shuts-off/#comment-169100 hi, me again, i fixed several c640 with replacing th u45 chip.. but now i don't have a u45 chip anymore the fix another c640 lap.. but i have here 3 motherboards from toshiba , (sp6100, tecra9100) is the u45 chip on these boards also? if yes, where are they located? and are there more maxim chips for 2,9 volts on a c640/c600/c610 board? or is it just one? thanx a lot for any reply!! frank hi,

me again,

i fixed several c640 with replacing th u45 chip..
but now i don’t have a u45 chip anymore the fix another c640
lap..
but i have here 3 motherboards from toshiba , (sp6100, tecra9100)
is the u45 chip on these boards also?
if yes, where are they located?
and are there more maxim chips for 2,9 volts on a c640/c600/c610 board? or is it just one?

thanx a lot for any reply!!

frank

]]> By: sarah kinley http://www.asklaptopfreak.com/laptop-notebook-help/2006/07/09/dell-latitude-c640-shuts-off/comment-page-4/#comment-159914 sarah kinley Sun, 27 Dec 2009 14:48:43 +0000 http://www.asklaptopfreak.com/laptop-notebook-help/2006/07/09/dell-latitude-c640-shuts-off/#comment-159914 i have a similar problem, i have a dell microsoft windows xp. i don't know anything about laptops so.. when i press the on button the windows loading thing comes up and once its done it goes black, i think the screen might be broken but i'm not sure,i was wondering is there anything i can do before i go to a shop? i have a similar problem, i have a dell microsoft windows xp. i don’t know anything about laptops so.. when i press the on button the windows loading thing comes up and once its done it goes black, i think the screen might be broken but i’m not sure,i was wondering is there anything i can do before i go to a shop?

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